Washington, US (BBN) - President Donald Trump has signed an executive order rolling back Obama-era rules aimed at curbing climate change.
The president said this would put an end to the "war on coal" and "job-killing regulations", reports BBC.
The Energy Independence Executive Order suspends more than half a dozen measures enacted by his predecessor, and boosts fossil fuels.
Business groups have praised the Trump administration's move but environmental campaigners have condemned it.
Outside the White House, a few hundred protesters gathered to vent their displeasure at the executive order.
Inside, the president was flanked by coal miners as he signed the order, saying: "My administration is putting an end to the war on coal.
"With today's executive action I am taking historic steps to lift the restrictions on American energy, to reverse government intrusion and to cancel job-killing regulations."
During the campaign, he vowed to pull the US out of the Paris climate deal agreed in December 2015.
WHAT IS MR TRUMP'S ORDER CHANGING?
President Trump takes a very different approach to the environment from Obama. The former president argued that climate change was "real and cannot be ignored".
Among the initiatives now rescinded is the Clean Power Plan, which required states to slash carbon emissions, to meet US commitments under the Paris accord.
The regulation has been unpopular in Republican-run states, where it has been subject to legal challenges - especially from businesses that rely on burning oil, coal and gas.
Last year the Supreme Court temporarily halted the plan, while the challenges are heard.
The Trump administration says that scrapping the plan will put people to work and reduce America's reliance on imported fuel.
It says the president will be "moving forward on energy production in the US".
"The previous administration devalued workers with their policies. We can protect the environment while providing people with work."
During the president's maiden visit to the Environmental Protection Agency, he signed the Energy Independence Executive Order, which cuts EPA regulations in order to support Mr Trump's plan of cutting the agency's budget by a third.
He recently appointed climate change sceptic Scott Pruitt as its new head.
WILL THE US HONOUR ITS COMMITMENTS UNDER THE PARIS CLIMATE DEAL?
While campaigning for the presidency, Trump argued that the agreement was unfair to the US.
The landmark agreement commits governments to moving their economies away from fossil fuels and reducing carbon emissions to try to contain global temperature rise.
Trump has in the past said climate change had been "created by and for the Chinese".
But at the end of last year, he acknowledged that there was "some connectivity" between human activity and climate change.
It is now unclear where exactly the US stands in relation to the deal.
Whatever the US chooses, the EU, India and China say they will stick to their pledges made in Paris.
WHAT HAS BEEN THE REACTION?
The president's order will be resisted by environmentalists, who have promised to challenge it in the courts.
"These actions are an assault on American values and they endanger the health, safety and prosperity of every American," billionaire environmental activist Tom Steyer was quoted by Reuters as saying.
"I think it is a climate destruction plan in place of a climate action plan," the Natural Resources Defense Council's David Doniger told the BBC, adding that they will fight the president in court.
Another green group, Earthjustice, said it would challenge the measure in and out of court.
"This order ignores the law and scientific reality," its President Trip Van Noppen said.
DOES TRUMP BELIEVE IN CLIMATE CHANGE?
Yes - at least according to a senior aide.
When asked whether the president believes in man-made climate change, the aide said "sure", adopting a matter-of-fact tone.
This marks a shift. In 2015 the president said that climate change was a "hoax".
By November 2016, the president had softened his position on the matter, saying he saw "some connectivity" between man and climate change.
Now the president has gone further - at least, according to his aide.
The president, a one-time climate-change denier, now believes, that climate change is real - and that humans are behind it.
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